please help!

Consider the following project. Activity Immediate Predecessors Normal cost ($) B C D E F G H A B C, D D E E, F Normal Duration (months) 3 4 2 6 8 7 4 9 700 900 1,100 600 800 1,300 500 800 (a) Draw the project network diagram (b) List all the paths in the network diagram. Say which ones are critical paths and what the minimum project duration is. (c) For each activity compute ES, EF, LS, LF and slack. Then, say which activities are critical. (d) What is the cost of completing the project if its duration is what you obtained in (b)